Make handleAnswerPrimaryMaster, handleRequestNodeIdentification and handleAskPrimaryMaster resilient to connection loss. As they are involved in question-response exchanges during election on connections which will get dropped as soon as a master arises, they must check if the connection is still opened before trying to send.
Note: the connection might get closed anyway during the actual send, but this is handled separately already. The problem we fix here emerged because of more tedious checkings in Connection's ask & answer methods.


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consistent with client <> master communication.


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Don't let polling thread die from any exception. Instead, emit a log with exception traceback and retry polling.


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The recovery stage is used only one time, when switching to primary state.
Each time the cluster lost the operational status (a cell has no up to date
node), the verification stage restart.


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storage is gathering the full table. 


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already known by UUID. This avoid duplicate entries in the node manager.


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broadcast it as down state. Just broadcast its information and running state.
Master don't send the partition table to storage node, they are it from the
initialization storage stage.


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Move common handlers in handler.py module.
Add InitializationHandler, applied on the master connection while retreiving
the partition table and node list.
Replace a call to (inexistant) method handleUnexpectedPacket with a raise of
UnexpectedPacketError exception.


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- test more steps
- fix erroneous assertion
- use a local variable to detect that all handler were executed, rather than a class variable


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handlers/replication.py in commit #778.


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directory. Replicator's handler is moved into handlers/replication.py. 
Clean some imports.


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- Split completely expected packet handlers from asynchronous event handlers
- Remove NEOStorageConnectionFailure exception and replace it by a more general "ConnectionClosed" exception, purely internal to client app.
- Modify waitMessage to redirect to a handler based on remote peer type
- Fix multiple code paths taken when master doesn't accept connections (or closes them) while trying to conenct to it.
Also:
- remove unused imports found by pyflakes


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Add lock/release around each "close" call in client which wasn't already locked.


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- generic base handler
- client connection handlers
- master connection handlers


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Update users.


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For now, it's a no-op for any non-storage node.


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